Centrifugal machine.



No. 832,047. PATENTED OCT; 2, 1906. A. J. ERIGSSON.

OBNTRIFUGAL MACHINE.

APPLICATION FILED MAY 19, 1905.

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A4, m4 iwwb j H No. 832,047. PATENTED OCT. 2, 1906. A. J. ERIOSSON.

GENTRIFUGAL MACHINE.

APPLIUATION FILED MAY 19. 1905.

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UNITED STATES PATENT" oFFIoE.

ANDERS J OHAN ERIOSSON, OF STOOKHOLM, SWEDEN, ASSIGNOR TOAKTIEBOLAGET'SEPARATOR, OF STOOKHOLM, SWEDEN.

CENTRIFUGAL MACHINE.-

Specification ofLetters Patent;

Patented Oct. 2, 1906.

ings, and to letters of reference marked there-- on, which form a partof this specification.

My invention relates to improvements in centrifugal separators such asused for separating liquids'from solid matters, and more especially toseparators of. such art as described in my United States Patent No.-

773,489, and it more particularly relates to' arrangements forfacilltating the continuous carrying away of the solid'matters out ofthe se arator. As is more fully described in the said United StatesPatent No. 773,489, the solids that stratify along the innerwall of thebowl are brought outside the bowlby means of scraper-wheels, carryingthe solid matterstransversely throughthe layer of liquid to'a pointwithin the same nearer the center of the bowl, whence the solid mattersare continuously carried away in such a manner that they immediatelybefore the scrapers of the scraper-wheels occupy their positlon nearestthe center of the bowl, owing to the action of the centrifugal forceandtheir own gravity, areloosened from the. scrapers and then throwndownward through a central-opening.

into a partition placed under the scraperwheels or in the very bottom ofthe bowl. It is,.however, evident that if the rotary speed ofthe bowlis-relatively high the gravity will.

be of no importance, but the solids are thrown out in the direction ofthe centrifugal force,.whereby the contents of the scrapers will againbe thrown out toward the periphery ofthe bowl.

My invention relates to a device for preventing this inconvenience, sothat even when the rotary speed of the bowl is relatively high the solidmatters may not be thrown out of the scraperstoward the periphery of thedrum, but are caught. bythis device and brought outside the bowl.

The device is illustrated on the accompanying drawings, wherein igure 1is a vertical section of a centrifugal bowl with a portion of myimprovement applied thereto. Fig. 2 shows a part of the centrifugal bowlof Fig. 1 in invested plan view. Fig. 3 is a partial section of a cenetrifugal bowl with a portion of my improve ment applied thereto; Fig. 4,a detail in plan view of Fig. 3. Fig. 5 is a partial section of acentrifugal bowl with my improvement applied thereto.

Like letters of reference indicate like parts in the difl'erent figures.

Taking first Figs. 1 and 2, the bowl consists of an upper art or cover aand an unolerv part or bottom screwed together in the usual manner.

The driving-shaft c of the bowlis at the top enlarged to a flange (:1,riveted to the bottom= of the bowl'or integralwith it. Betweenthe flange(Z and the bottom?) ofthe bowl channels d d are located. Thedriving-shaft c is hollow andwithin the samethe massive shaft eprojects, on the top of which. a.nave*f,.in.-

tegral with the cross-pieces 9,1 is mounted.v

This cross-piece g is provided with, short shafts h h, which aresecuredto the crosspiece by means of nuts or the like. On these shaftsthe scraperewheels i i and the cog: wheels k is move. the cog-wheels aresecured toeach other;

The cog-wheels 7c, 76 are in gearing with a;cog

ring on a central disk '1, which is secured to the bowl by means ofstays m. By this ar rangement the shafts h h and the cog-wheels.

1c 7c and the scraper-wheels 'M'willreceive a.

motion relative to the bowl when the shaft 0 has a speed higher or lowerthan that of the shaft e. At. the same time the scraper wheels 'L i willrotate on'their shafts h h as the cog-wheels 7c 76 are in. gearingxwiththe cog;

The bottom I) is provided with a. central circular opening b,incliningoutward.

The scraper-wheels and ringon the disk 1.. The scraper-wheels i if areprovided with. scrapers n. of scoopor shovel. shape. The cross-piece g.is,. as is:

shown in Figs, 1 and2, provided with obliquelyupward'directedshieldeshapedparts 0,

thus situated that the scrapers on. rotatlng pass between them and thecenterofthe bowl. The inclined. edge of the opening; in

the bottom-of thebowl forms acontinuation of the obliquely di rectedshieldso. Byfthis arrangement the solid matters being brought by meansof the scrapers to a position nearest to the center of the bowl fromwhere they are thrown out horizontally in the direction of thecentrifugal force will on their movement outward meet the shields 0 ofthe crosspiece g and are caught by them. Consequently they will bedirected obliquelydown-v ward and slide on the parts 0 and the inclinededge of the opening in the bottom to the channels (1 between the flanged and the bottom I) of the bowl, through which chan nels they arebrought outside the bowl.

The constructional form shown in Figs. 3 and 4 differs from that showninFigs. 1 and 2, inasmuch as the obliquely-directed shieldshaped parts 0have a cylindrical extension 1" reaching slightly below the edge of theopening in the bottom of the bowl. The solid matters being caught by theparts 0 slide thereon downward and reach the cylindrical parts 1", fromwhich they are removed by means of a scraper-wheel p, the edges of whichare turned or inclined, so that when moving they will bring the solidmatters downward. On leaving the lower edge of the extension 1" thesolid matters flow outside the bowl through the channels 61. Thescraper-wheel -12 is secured to the flange (1 by means of nuts or in anyother suitable manner, so that it rotates relatively to the crosspieceg.

A third constructional form is shown in Fig. 5. In this modification thescrapers n are each provided with a shield 0, that inclines to thecenter axis of the shaft h. When the scrapers occupy the positionnearest to the center of the bowl, the solid matters I slide downward onthe shields 0 and are thrown out toward the shield-shaped parts 0 overthe edges of the shields 0. Then they are brought outside the bowl inthe same manner as indicated by reference to Figs. 1 and 2. It isevident that the parts 0 need not in this case reach more thanimmediately above the. lower edges of the shields 0. In Fig. 5 theshields 0 form together a conical ring on the scraper-wheels; but it isclear that they need not be integral with each other. It is evident thatthe wall of the bowl can be perforated or not.

What I claim is 1. In a centrifugal machine the combination with therotary bowl having scraper- -wheels for conveying the solid mattersstratified on the walls to a point nearer the center line of the bowl,said scraper-wheels being driven by a separate shaft with a speeddifferent from that of the bowl, of an inclined shield for eachscaper-wheel intersecting a plane through the center line of the bowland the center line of the scraper-wheel and located between therotating scrapers and the center of the scraper-wheel and extendingdownward over the central-opening in the bottom of the bowl.

2. In a centrifugal machine the combina tion with the rotary bowl havingscraperwheels for conveying the solid matters stratified on the walls toa point nearer the center line of the bowl, said scraper-wheels beingdriven by a separate shaft with a speed different from that of the bowl,of an inclined shield for each scraper-wheel intersecting a planethrough the center line of the bowl and the center line of thescraper-wheel and located between the rotating scrapers and the centerof the scraper-wheel and extending downward over the central opening inthe bottom of the bowl, said shields forming part of the central diskupon which the shafts of the scraper-wheels are mounted.

3. In a centrifugal machine the combination with the rotary bowl havingscraperwheels for conveying the solid matters stratified on the walls toa point nearer the center line of the bowl, said scraper-wheels beingdriven by a separate shaft with a speed different from that of the bowl,of an inclined shield for each scraper-wheel intersecting a planethrough the center line of the bowl and the center line of thescraper-wheel andlocated between the rotating scrapers and the center ofthe scraper-wheel and extending downward over the central opening in thebottom of the bowl, said shields provided with cylindrical extensionsprojecting over the lower edge of the central opening and meansforscraping ofi the solid matters stratifying on said cylindrical extensionand conveying them to the outlet.

4. In a centrifugal machine the combination with the rotary bowl havingscraperwheels for conveying the solid matters stratified on the walls toa point nearer the center line of the bowl, said scraper-wheels beingdriven by a separate shaft with a speed different from that of the bowl,of an inclined shield for each scraper-wheel intersecting a planethrough the center line of the bowl and the center line of thescraper-wheel and located between the rotating scrapers and the centerof the scraper-wheel and extending downward over the central opening inthe bottom of the bowl, said shields provided with cylindricalextensions projecting over the lower edge of the central opening andinclined scrapers fixed at the bowl and located in the central openingin the bottom of the bowl.

5. In a centrifugal machine the combination with the rotary bowl ofscraper-wheels for conveying the solid matters stratified on the wallsto a point nearer the center line of the bowl, said scrapenwheels beingdriven by a separate shaft with a speed different from that of the bowl,the scrapers of said and of an inclined shield for each scraperwheel,intersecting a plane through the center line of the bowl and the centerline of the scraper-wheel and located below the scraperwheel, betweenthe scrapers and the center of the scraper-wheel and extending clownwardover the edge of the central opening in the bottom of the bowl.

6. In a centrifugal machine, in combination, a rotary bowl provided withan opening and scrapers adapted to convey the solid material on thewallof the bowltoward the center of the bowl, and a shield inclined at anangle to the axis of the bowl.

7. I11 a centrifugal machine, in combination, a rotary bowl providedwith an opening and scrapers adapted to convey the solid material on thewall of the bowl toward the center of the bowl, and a shield inclined atan angle to the axes of the bowl and scraper.

8. In .a centrifugal machine, in combina tion, a rotary bowl providedwith an opening and scrapers adapted to convey the solid material on thewall of the bowl toward the center of the bowl, a shield inclined at anangle to the axis of the bowl, said shield extending downward into saidopening in the bowl.

9. In a centrifugal machine, in combination, a rotary bowl provided withan opening and scrapers adapted to convey the solid. material on thewall of the bowl toward the center of the bowl, a shield inclined at anangle to the axes of the bowl and scraper, said shield extendingdownward into said opening in the bowl.

10. In a centrifugal machine, in combination, a rotary bowl providedwith an opening and scrapers adapted to convey the solid material on thewall of the bowl toward the center of the bowl, a shield inclined at anangle to the axis of the bowl, said shield having a vertical extensionextending into said openmg.

11. In a centrifugal machine, in combina tion, a rotary bowl providedwith an opening and scrapers adapted to convey the solid material on thewall of the bowl toward the center of the bowl, a shield inclined at anangle to the axes of the bowl and scraper, said shield having a verticalextension extending into said opening.

12. In a centrifugal machine, in combination, a rotary bowl providedwith an opening and scrapers adapted to convey the solid material on thewall of the bowl toward the center of the bowl, a shield inclined at anangle to the axis of the bowl, said shield having a vertical extensionextending into said opening, and means to remove the solids adhering tosaid extension and carry them to the outlet.

13. In a centrifugal machine, in combination, a rotary bowl providedwith an opening and scrapers adapted to convey the solid ma terial onthe wall of the bowl toward the center of the bowl, a shield inclined atan angle to the axes of the bowl and scraper, said shield. having avertical extension extending into said opening, and means to remove thesolids adhering to said extension and carry them to the outlet.

14. In a centrifugal machine, in combination, a rotary bowl, providedwith an opening, and scrapers adapted to convey the solid material onthe wall of the bowl toward the center, and a shield for each scraper,said shield being at an angle to the axis of the bowl.

15. In a centrifugal machine, in combina-.

